Usually means: Celebration of someone's annual birth.
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We found 7 dictionaries that define the word bday:

General (4 matching dictionaries)
  1. b'day: Oxford Learner's Dictionaries
  2. B'Day, BDay, B'day, Bday, b'day, bday: Wordnik
  3. bday: Wiktionary
  4. BDAY: Dictionary.com

Miscellaneous (2 matching dictionaries)
  1. BDAY: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. B'Day, bday: Urban Dictionary

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Definitions from Wiktionary (Bday)

▸ noun:  (Internet slang, text messaging) Abbreviation of birthday. [The anniversary of the day on which someone is born.]

Similar:
biog., textism, bio., y.o., rgds, anniv, Brit., bfast, birth cert, bro., more...

Opposite:
deathiversary, unbirthday, non-birthday



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Similar:
biog., textism, bio., y.o., rgds, anniv, Brit., bfast, birth cert, bro., more...

Opposite:
deathiversary, unbirthday, non-birthday



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